private void ImportPlaylist(object sender, RoutedEventArgs e)
        {
            if (!MenuShowPlaylists.IsChecked)
            {
                return;
            }

            try
            {
                OpenFileDialog dialog = new OpenFileDialog {
                    DefaultExt = "xml"
                };
                if (dialog.ShowDialog() == true)
                {
                    _playlistManager.ImportPlaylist(dialog.FileName);
                }

                ShowPlaylists(sender, e);
            }
            catch (Exception ex)
            {
                new AlertMessage(ex.Message, ex.StackTrace).ShowDialog();
            }
        }